Electronic Principles
The dielectric constant of a material is a measure of:

the amount of voltage it can withstand before breaking down
how well the material concentrates magnetic lines of force
the amount of opposition to the current flow
how well the material concentrates electrostatic lines of force
None of these

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Electronic Principles
The south pole of a magnet is the one:

that has its molecules arranged in a random pattern
that would be attracted to the earths north magnetic pole
that would be repelled by the north pole of another magnet
None of these
that would be attracted to the earth's south magnetic pole

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Electronic Principles
Current is

An imbalance of electrical charges
The force that causes electrons to flow
None of these
The flow of charged particles through a material
The number of free electrons in an atom

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Electronic Principles
The core of an electromagnet is said to be in saturation when:

the core is permitted to move freely within the coil
changing the polarity of the current in the coil changes the polarity of the magnetic field around the core
frequent changes in the direction of current through the coil causes heating effects in the core material
None of these
an increase in current through the coil causes no further increase in the mmf

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